Bonus question first: With the name "Jonamac," what could the two parents of this apple be? This variety is a straightforward blend of many of Jonathan's and McIntosh's fine qualities, with an emphasis on the Mac.
Jonamac has a streaky dull red blush over a bright spring green, decorated with light lenticels. It is medium large and ribbed. My sample is slightly conical and wears a few spots of flyspeck.
Its flesh is white and medium-dense, with both crunch and juice. A good sweet-tart balance sets up a pleasing vinous effect, with berries and a little spice, and some real depth.
Despite my posting date, this is an early apple—I bought mine on September 2. This Jonathan-McIntosh cross is very successful at bringing some Mac-like flavors at the start of the season.
Update: A reader says my sample is really too early and that Jonamac peaks around the end of September.